EP0704097A1 - Process and device for controlling electromagnetic consumers - Google Patents

Process and device for controlling electromagnetic consumers

Info

Publication number
EP0704097A1
EP0704097A1 EP19950913053 EP95913053A EP0704097A1 EP 0704097 A1 EP0704097 A1 EP 0704097A1 EP 19950913053 EP19950913053 EP 19950913053 EP 95913053 A EP95913053 A EP 95913053A EP 0704097 A1 EP0704097 A1 EP 0704097A1
Authority
EP
European Patent Office
Prior art keywords
energy
characterized
switching means
phase
consumer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19950913053
Other languages
German (de)
French (fr)
Other versions
EP0704097B1 (en
Inventor
Torsten Henke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE4413240 priority Critical
Priority to DE19944413240 priority patent/DE4413240A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE1995/000408 priority patent/WO1995028721A1/en
Publication of EP0704097A1 publication Critical patent/EP0704097A1/en
Application granted granted Critical
Publication of EP0704097B1 publication Critical patent/EP0704097B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1816Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F02D2041/2006Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027Control of the current by pulse width modulation or duty cycle control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2068Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2072Bridge circuits, i.e. the load being placed in the diagonal of a bridge to be controlled in both directions

Abstract

A process and device are disclosed for controlling an electromagnetic consumer (100), in particular an electrovalve for controlling the amount of injected fuel. An energy-storage element (145) is arranged between a half bridge and a voltage source (Ubat).

Description

Apparatus and a method for driving a magnetic consumer elektro¬

State of the art

The invention relates to an apparatus and a method for driving an electromagnetic load according to the preambles of the independent claims.

There are devices and methods for actuating an electromagnetic load (100), in particular a solenoid valve for controlling the quantity of fuel to be injected, by means of a known half bridge. These obligations Vorrich¬ the released when switching off energy is converted into heat by means of Zener diodes and lost.

A device for driving an electromagnetic consumer is known from DE-OS 37 02 680th a circuit arrangement for controlling a consumer elektromagne¬ tables is bort described. A arranged in series to Verbrau¬ cher electronic switching element is bridged by ei¬ nen quenching circuit. This Lδschkreis contains an energy store in the form of a capacitor for receiving the energy stored in the consumer. A disadvantage with die¬ ser circuit arrangement is that it is complicated and components for intermediate storage of energy sator requires a bulky Konden¬ that is always loaded at least on Versorgungsspan¬ voltage. In addition to the capacitor, two series diodes are at least required.

With this device with each gear change, the information stored in the consumer energy stored in a capacitor. This temporarily stored energy is directed at the next control in a second consumer.

Furthermore, a device for driving a Verbrau¬ Chers from DE-OS 37 34 415 is known. There, the heat released during turn-off energy is stored in a capacitor ge. When you turn the stored energy is delivered to the consumer. For this purpose, at least two further switching means are required with respect to a direction Ein¬ without energy recovery.

OBJECT OF THE INVENTION

The invention is based on the object at a Vorrich¬ a simple as possible constructed tung device for driving an electromagnetic consumer bereitzustel¬ len, with the switch-accelerated and the total energy consumption Ge is minimized. Advantages of the Invention

The inventive circuit arrangement with the features of the independent claims has the advantage that there is a lossless deletion. Furthermore, can increased by the re-use of the stored energy during Lδschvorgang at power up, the current increase the wer¬. This in turn means that the switching time Magnetventil¬ ve ^ inger .- These benefits in a ge wrestle component .-. Expenses reached. Other prior eilhafte Ausge¬ are staltungen characterized in the dependent claims geker _-..

drawing

The inventive device is explained below with reference to the shown in the drawings embodiments. 1 shows a circuit arrangement of the inventive device, Figure 2 verbe different aufge¬ over time transmitted signals and Figures 3 and 4: ~ tung arrangements erte Schal¬.

Description of Embodiments

The inventive device is preferred engine at Brenn¬, in particular in self-igniting Brennkraft¬ machinery used. There, the fuel metering is controlled by means of electromagnetic valves. These electromagnetic valves are referred to as Verbrau¬ cher. The invention is not limited to these An¬ application, it can be used where fast-switching solenoid valves are needed everywhere.

In such applications, the opening and Schließzeit¬ set point of a solenoid valve determines the start of injection and the Ein¬ spurting.

Typically, the time period between the actuation of the solenoid valve and the actual opening or closing of the solenoid valve is referred to as switching time. In particular with diesel engines, it is desirable that the switching time is minimized.

In order to achieve the smallest possible switching times a mög¬ is lichst faster force build-up or power degradation in the consumer required. Such rapid force build-up and power degradation can or by a correspondingly rapid current build-up, power loss can be achieved.

In Figure 1 the essential elements of the device of invention to the invention are shown. With 100 of the anzusteu¬ ernde consumer is referred. A first terminal of the method brauchers 100 communicates with a node 105 and the second terminal connected to a node 110 in Verbin¬ dung. The connection point 100 is connected via a first Schalt¬ medium 115 to the ground terminal 120th The second connection point 110 is connected to the cathode of a first diode 125 in contact. The anode of the first diode 125 is connected to ground potential. 5 -

Furthermore is the point of attachment 105 to the anode of a second diode 130 in contact. The connection point 110 is connected via a second switching means 135 to the cathode of the second diode 130 in contact.

The connection point between the cathode of the second diode 130 and the switching means 135 is the one connected to the cathode of a third diode 140 and one terminal of a Konden¬ crystallizer 145 in contact. The second terminal of the capacitor 145 and the anode of the third diode 140 are in communication with the supply voltage this U] with a voltage source - acted upon> at.

The arrangement of the consumer 100, the two switching means 115 and 135 as well as the first and second diodes 125 and 130 is commonly referred to as half-bridge.

Usually in fuel metering in Brenn¬ combustion engines more solenoid valves required. Dashed line is an embodiment with two solenoid valves darge provides. In this case, the cathode of another diode 131 with the cathode of diode 130 is connected. The anode of another diode 131 is connected to a switching means 116 and to one terminal of the further consumer 101 in contact. Via the switching means 116, the anode of the diode 131 and one terminal of the load 101 to ground in conjunc- is άwϊig. The second terminal of the load 101 is connected to the cathode of diode 125 and to the Shortcut ngspunkt 110 contacts. Correspondingly, even more consumers can be switched be¬.

In the control of the consumer in this circuit arrangement with a characteristic power profile may be distinguished different phases ver¬. In a first phase, which usually occurs only when you first turn in entlade¬ NEM capacitor 145, the first switching means 115 and the second switching means 135 are closed and give the current flow through the consumer free. In this phase, the current flows through the path consisting of the third diode 140, the second switching means 135, the consumer 100 and the first switching means 115th

In a second phase, which is also referred to as Lδschphase, the first switching means 115 and the second medium 135 Schalt¬ are open in their condition. In this phase, a current flows through the path consisting of the first diode 125, the consumer 100, the second diode 130 and the capacitor 145. During this phase, the consumers in Ver¬ 100 energy stored in the capacitor 145 as the power source so¬ transhipped. The aim of the clearing phase is to reduce the current flowing through the load as quickly as possible to zero.

In a third phase, the first switching means 115 and the second switching means 135 is closed and the current flows through the path consisting of the capacitor 145, the zwei¬ th switching means 135, the consumer 100 and the first switching means 115. In this phase, in the capacitor 145 stored energy back into the consumer and transfer energy from the power source to the consumer. This phase is also called the tightening phase bezeich¬ net. The aim of which is to keep by a high current level, the closing time of the solenoid valve as low as possible.

In a fourth phase, the current flows through the path beste¬ starting from the third diode 140, the second switching means 135, the consumer 100 and the first switching means 115. In this stage, the loss of energy is provided by the voltage source. The third diode 140 prevents the capacitor 145 is charging positive.

ver¬ in a fifth phase, the so-called holding current phase, the second switch means remains closed in its state 135 and the switching means 115 is operated in a clocked, it means it is alternately opened and closed. This takes place in such a rule that sets a certain current value in the time average. During this clock phase, switches abge¬ in between energizing and freewheeling, the capacitor 145 remains in its ent-charged state. In the holding current phase, the Verlust¬ is derated by decreasing the target current level and through the bars.

The operation of this arrangement will be described below with reference to FIG. 2 2 shows various signals are plotted versus time. In the first line of a drive signal for the second switching means 135 is aufgetra¬ gene which defines the control of the solenoid valve and thus the Be¬ beginning and end of fuel metering. Is the current flowing through the solenoid valve in the second row - 8

Current, and in the third line, which at the cathode of diode 140 to ground the voltage applied, applied. This voltage corresponds to closed first switch 115 and second switch 135, the an¬ lying voltage across the solenoid valve.

the various phases are also shown in FIG. 2 At the time Tl the Steu¬ shown in the first line of Figure 2, a Ansteuerein- not shown are standardized, ersignal from. In the presence of this signal, the switching means includes 135. In the presence of the applied signal in the second line of the first switching means 115 is current flow freely.

The capacitor 145 already charged se from an earlier Löschpha¬, the third phase begins at time Tl. That is, the applied in the third line current I flowing through the solenoid valve increases sinusoidally. At the same time at the cathode of the third diode 140 to ground voltage U ^, which is shown in the fourth line falls off cosinusoidally. At time T2, this third phase ends.

At time T2, the third at the cathode of diode 140 is the voltage applied Uj- to a value U j -, at abgefal¬ len. This means that the capacitor 145 is no longer wei¬ ter discharged as applied to the capacitor voltage U c becomes zero. Furthermore, the third diode 140 prevents a positive charging of the capacitor 145. From the time T2 to the time T3 is the device in the fourth phase, in which the Versor¬ supply voltage provides the necessary energy. The voltage applied to the third diode 140 and the capacitor 140 voltage remains at the value zero. The current increases during this phase linearly over time until it reaches its pregiven starting current value i ^.

Depending on the type of the electromagnetic load 100 may also be provided that the current to the inrush current setpoint i- ^ correspondingly as in the fünf¬ th phase is controlled in this phase.

To time T3, the device reaches the fifth stage, called the timing phase. In this phase, is adjusted to a vorgebba¬ ren holding current setpoint ± 2 by opening and closing the first switching means 115, the current flowing through the load.

Preferably, a two-point regulator is used here, which compares the current flowing through the load current with a predeterminable cash value. If the current exceeds an upper value, the switching means opens only the current tet 115. Unterschrei¬ a lower value, the switch means 115 opens, this causes the current in this fifth phase between the upper and the lower value to and fro pen¬ delt. In this fifth phase, the second switching means 135 remains closed, therefore does not Energieumladung between capacitor 140 and load 100 instead. At the timing phase, the second phase will follow from the time T4. ends at the time T4, the applied in the first and second line of the Figure 2 drive signals. This means that both switching means are opened. This has the consequence that the current decreases sinusoidally. Gleichzei¬ tig the voltage U j increases - the capacitor 145 and to the cathode of the third diode 140 to a value above the supply voltage U D U] -, a t. This means the capacitor is recharged.

According to the invention, the capacitor 145 and the Verbrau¬ form cher 100 a resonant circuit in which the energy of the second phase by the consumer in the voltage source and the capacitor 145 and in the third phase from the Spannungs¬ source and the capacitor to charge reversal in the consumer 145 is , During the timing, in the fifth phase, no charge reversal between the consumer and the capacitor occurs.

This provides the advantage that at the beginning and end of the energization of the consumer a rapid change of the current flowing through the load current results in the second and third phases resulting in very short response times of Verbrau¬ chers. Characterized in that in addition to the capacitor 145 and the voltage source part of the resonant circuit bil¬ det, the erasing phase and the pull-up phase and thus also the switching time is shortened further. Thus, a smaller design results with the same switching time.

In addition to the shortened on / off times do not occur Ener¬ gieverluste by the deletion. The energy transition returned to the condenser at Lδschvor- is recovered at startup.

These advantages result essentially by the inventive combination of a half-bridge and a suitably-connected energy-storing element, and the diode 140. This energy-storing element 145 is in series zwi¬ the supply voltage and the half-bridge's connected.

In general, the self-discharge of the capacitor 145 is very small. Only when set in motion, it may happen that the capacitor is partially discharged. This causes that is slower when current is supplied to the consumer iieser first current structure. To this; To resolve -.chteil the position shown in Figure 3a further embodiment of the invention is proposed.

In addition to those already described in Figure 1 components that are the same as indicated in Figure 1, a further switching means 200 is disposed between the supply voltage and the capacitor 145th The connection point between said switching means 200 is an additional switch means 220 connected to ground. To charge the capacitor, the switching means are open 135 and 115, which zusätzli¬ che switching means 220 is closed and the other Schaltmit¬ tel 200 also open. Thereby, the capacitor is charged to the supply voltage, so that is available for the first Strom¬ construction after a prolonged standstill additional energy to Be¬ acceleration of the current buildup. 3b shows a further embodiment. Apart from the already shown in figure 3a elements zwi¬ rule the additional switching means 220 and the further switching means 200, an inductance 210 is arranged. This circuit has the advantage that the capacitor circuit through the inductor 210 and capacitor 145 from Schwing¬ formed is charged to a voltage which corresponds to twice the supply voltage.

Figure 4 shows a further embodiment of the invention. Ben Ne¬ the components already described in Figure 1, which are the same as indicated in Figure 1, a further switching means 200 is disposed between the supply voltage and the capacitor 145th The connection point between said switching means 200 and the capacitor 145 is connected to the junction between diode 130, load 100 and switching means 115 in contact.

Further, the connection point 110 via a switching means 400 is connected to ground.

To charge the capacitor 145, the switching means are open 135 and 115, the switching means 200 and 400 sen geschlos¬. Thereby, the capacitor is charged to a voltage which corresponds to twice the supply voltage. In this embodiment, the consumer acquires 100 the tasks of the throttle 210th

In this embodiment, it is advantageous that a ent speaking charging of the capacitor, such as during the construction of shown in FIG 3b is possible, but not che zusätzli¬ choke is needed.

The switching means are preferably embodied as transistors, more particularly sondere as field effect transistors can be realized. The Schalt¬ medium be acted upon by a non-illustrated control unit with drive signals.

Claims

14 entitlement to benefits
1. Device for actuating an electromagnetic load (100), in particular a solenoid valve for controlling the fuel quantity, by means of ei¬ ner half-bridge, characterized in that between the half-bridge and a Spannungungsquelle (Ub a t) a energie¬ storing member (145) is arranged.
2. Device according to claim 1, characterized in that energy-storing element turns ver¬ as (145) a capacitor.
is switched 3. Device according to one of the preceding claims, characterized in that the energy-storing element parallel to Ele¬ (145) includes a diode (140).
4. Device according to one of the preceding claims, characterized in that a further switching means (200) is disposed between the energy-storing element (145) and the voltage source.
5. A method for driving an electromagnetic Ver¬ brauchers (100), in particular a solenoid valve for Steue¬ tion of the injected Kra tstoffmenge, characterized by a half-bridge characterized in that switching means of the half-bridge can be controlled so that a bridge between the Halb¬ and a Spannungssquelle (100) exchange energy Uj-, at arranged energy-storing element (145) and / or a voltage source to the consumer.
6. The method according to claim 6, characterized in that in a second phase (Lδschphase) energy consumer (100) in the energy-storing element (145) and / or the voltage source is transferred.
7. The method according to any one of the preceding claims, characterized in that in the second phase the first Schalt¬ medium (115) and the second switching means (135) is such ansteu¬ Erbar that a current flowing in a path comprising a first diode (125), the consumer (100), a second diode (130) and the energy-storing element (145) and / or the voltage source is established.
8. The method according to any one of the preceding claims, characterized in that in a third phase, energy from the ener¬ giespeichernde element (145) and / or the voltage source in the load (100) is transferred.
9. The method according to any one of the preceding claims, characterized in that the first Schalt¬ medium (115) and the second switching means (135) are such an¬ controllable in a third phase, that a current flow in a path from the starting to beste¬ adjusting energy-storing element (145), said second switching means (135), the consumer (100) and the first switching means (115) via a diode (140).
10. The method according to any one of the preceding claims, characterized in that switching means (200, 220) are such angesteu- ert that the energy-storing element (145) is acted upon in ei¬ ner phase with energy from the voltage source.
EP19950913053 1994-04-16 1995-03-24 Process and device for controlling electromagnetic consumers Expired - Lifetime EP0704097B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4413240 1994-04-16
DE19944413240 DE4413240A1 (en) 1994-04-16 1994-04-16 Apparatus and a method for driving an electromagnetic load
PCT/DE1995/000408 WO1995028721A1 (en) 1994-04-16 1995-03-24 Process and device for controlling electromagnetic consumers

Publications (2)

Publication Number Publication Date
EP0704097A1 true EP0704097A1 (en) 1996-04-03
EP0704097B1 EP0704097B1 (en) 2000-02-16

Family

ID=6515630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950913053 Expired - Lifetime EP0704097B1 (en) 1994-04-16 1995-03-24 Process and device for controlling electromagnetic consumers

Country Status (5)

Country Link
US (1) US5729422A (en)
EP (1) EP0704097B1 (en)
JP (1) JPH08512436A (en)
DE (1) DE4413240A1 (en)
WO (1) WO1995028721A1 (en)

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Also Published As

Publication number Publication date
DE4413240A1 (en) 1995-10-19
EP0704097B1 (en) 2000-02-16
JPH08512436A (en) 1996-12-24
US5729422A (en) 1998-03-17
WO1995028721A1 (en) 1995-10-26

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